help needed - 3 wheeler veering to the right. How can I make it go in a staight line?

[BarkAtTheMoon]

Hi there. I have a 3 wheeler and its veering to the left, which is getting on my nerves.[Just a little bit!].
Does anyone have any ideas or know what to do about this problem.
Many thanks.

have you tried blowing up the tyres??one may have less air in it than the other?

Thank you but tried that. The local bike shop were very kind and did this for me. I asked advise too - the man I need to speak to is back on Thur.

Is it a fixed wheel 3 wheeler?
Sometimes the bike shop and fix the tracking for you?
Is the wheel a quick release one? If so - has it been put back on slightly wrongly? (I had a fixed wheel babyjogger that did this - I took the wheel off - and saw that there were 2 flat sides the the parts that clipped in and 2 curved - and I'd jammed it in wrongly on the curved bits - when correctly lined up and fitted in place it worked perfectly).